1.1

The binary ABI from release 1.0.1 to 1.1 is backward compatible;
applications linked against libvorbis/libvorbisenc 1.0 and 1.0.1 will
continue to function correctly when upgrading the libvorbis and
libvorbisenc dynamic libraries without re-linking.

Deprecated in 1.1

These calls are still available to older codebases to preserve
compatability; the fields of the ovectl_ratemanage_arg argument
are mapped as closely as possible to the fields of the new ovectl_ratemanage2_arg
structure.